RFR: 8252191: Update to gcc 10.2 on Linux

Tue Oct 6 13:02:07 UTC 2020

On Tue, 6 Oct 2020 12:53:34 GMT, Kevin Rushforth <kcr at openjdk.org> wrote:

>>> Build and sanity test looks good on my machine.
>> 
>> What OS are you using? (I'm running a test on Ubuntu 18.04)
>
> I've run tests on Ubuntu 16.04, Ubuntu 20.04, and Oracle Linux 7.

I confirm it works on Ubuntu 18.04

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PR: https://git.openjdk.java.net/jfx/pull/311